Lenovo's Ideacentre Stick 300 is a 'PC on a stick' that will turn any screen with an HDMI port into a functioning Windows 10 computer. It's small, portable, not too expensive at £99 (inc. VAT), and it works. Of course it doesn't let you do everything a desktop PC or laptop would -- but is it a useful travelling companion?
Lenovo Ideacentre Stick 300 review at ZDNet
Lenovo Ideacentre Stick 300 review at ZDNet